That's a 100 million bump for Messenger, a 150 million pop for Groups, and a 100 million surge for WhatsApp since Facebook's last update in March. That's three months ago.

While there's undoubtedly a lot of cross-over in those user bases (and you can't use Groups without a proper Facebook account and Facebook only just made it possible to use Messenger without a main account), Instagram and WhatsApp give Facebook access to younger and international users who might not use the main service.

CEO Mark Zuckerberg told told Wired this spring that those apps are actually growing at a faster rate than Facebook's core app.